CVE-2026-54052: CWE-639: Authorization Bypass Through User-Controlled Key in czlonkowski n8n-mcp
CVE-2026-54052 is a critical authorization bypass vulnerability in n8n-mcp prior to version 2.56.1. When running in HTTP mode with multi-tenancy enabled, authenticated tenants could access and manipulate workflow version backups of other tenants. This includes reading sensitive workflow snapshots and deleting backups containing node definitions, credential references, and authorization headers. The issue is fixed in version 2.56.1.
AI Analysis
Technical Summary
The vulnerability in n8n-mcp (CVE-2026-54052) arises from improper isolation of local workflow version history backups in multi-tenant HTTP mode (ENABLE_MULTI_TENANT=true). Authenticated tenants could bypass authorization controls to read and delete backups belonging to other tenants. These backups contain sensitive data such as full node definitions, credential references, and authorization headers. This flaw is classified under CWE-639 (Authorization Bypass Through User-Controlled Key) and CWE-862 (Missing Authorization). The vulnerability has a CVSS 3.1 score of 9.9 (critical). It is resolved in n8n-mcp version 2.56.1.
Potential Impact
Exploitation allows an authenticated tenant to access and delete workflow version backups of other tenants, potentially exposing sensitive information including node definitions, credentials, and authorization headers. This compromises confidentiality, integrity, and availability of tenant data within the multi-tenant environment.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.56.1 or later, where this authorization bypass vulnerability is fixed. No other official remediation or temporary fixes are documented. Until upgrading, restrict access to trusted tenants only and consider disabling multi-tenancy if feasible.
CVE-2026-54052: CWE-639: Authorization Bypass Through User-Controlled Key in czlonkowski n8n-mcp
Description
CVE-2026-54052 is a critical authorization bypass vulnerability in n8n-mcp prior to version 2.56.1. When running in HTTP mode with multi-tenancy enabled, authenticated tenants could access and manipulate workflow version backups of other tenants. This includes reading sensitive workflow snapshots and deleting backups containing node definitions, credential references, and authorization headers. The issue is fixed in version 2.56.1.
CVSS v3.1
Score 9.9critical
Affected software
pkg:github/czlonkowski/n8n-mcpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n-mcp (CVE-2026-54052) arises from improper isolation of local workflow version history backups in multi-tenant HTTP mode (ENABLE_MULTI_TENANT=true). Authenticated tenants could bypass authorization controls to read and delete backups belonging to other tenants. These backups contain sensitive data such as full node definitions, credential references, and authorization headers. This flaw is classified under CWE-639 (Authorization Bypass Through User-Controlled Key) and CWE-862 (Missing Authorization). The vulnerability has a CVSS 3.1 score of 9.9 (critical). It is resolved in n8n-mcp version 2.56.1.
Potential Impact
Exploitation allows an authenticated tenant to access and delete workflow version backups of other tenants, potentially exposing sensitive information including node definitions, credentials, and authorization headers. This compromises confidentiality, integrity, and availability of tenant data within the multi-tenant environment.
Mitigation Recommendations
Upgrade n8n-mcp to version 2.56.1 or later, where this authorization bypass vulnerability is fixed. No other official remediation or temporary fixes are documented. Until upgrading, restrict access to trusted tenants only and consider disabling multi-tenancy if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T18:24:35.096Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57f59668715ace437838d8
Added to database: 07/15/2026, 21:03:18 UTC
Last enriched: 07/15/2026, 21:17:45 UTC
Last updated: 07/16/2026, 04:31:38 UTC
Views: 24
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